PUBLIC WORKS TECHNICAL BULLETIN
420-49-16
16 July 2001
CROSS-CONNECTION CONTROL
AT ARMY INSTALLATIONS
Public Works Technical Bulletins are published by the
U.S. Army, Corps of Engineers Washington, DC. They
are intended to provide information on specific topics in
areas of Facilities Engineering and Public Works. They
are not intended to establish new DA policy.
DEPARTMENT OF THE ARMY
U.S. Army Corps of Engineers
441 G street, NW
Washington, DC 20314-1000
CEMP-R
Public Works Technical Bulletin
No. 420-49-16
16 July 2001
FACILITIES ENGINEERING
UTILITIES
CROSS-CONNECTION CONTROL AT ARMY INSTALLATIONS
1. Purpose. The purpose of this Public Works Technical Bulletin (PWTB) is to provide an
overview of cross-connection control and backflow prevention at Army installations with
particular emphasis on regulatory aspects, technical guidelines and major elements of crossconnection control program.
2. Applicability. This PWTB applies to all U.S. Army Directorate Public Works activities
responsible for providing drinking water to consumers in accordance with requirements of the
Safe Drinking Water Act (SDWA) and its amendments, and applicable state and local
regulations.
3. References.
a. AR 420-49, Facilities Engineering, Utility Services, April 1997.
b. AR 40-5, Preventive Medicine, June 1985.
c. AR 200-1, Environmental Protection and Enhancement, February 1997
d. Public Law 93-523, Safe Drinking Water Act (SDWA), December 1974 and Amendments.
4. Discussion. A description and summary of various aspects of cross-connection control and
backflow prevention at Army installations is provided in the enclosed report. The report
addresses:
• Health and operational implications of cross-connections for potable water systems
• Causes of backflow, classification of hazards and methods of prevention.
• Requirements for cross-connection control based on Federal, State and Army regulations.
• Technical guidelines and references for cross-connection control.
• Key elements of a cross-connection control program.
• Lessons learned from cross-connection control efforts at Army installations.
5. Points of Contact. HQUSACE is the proponent for this document. The POC at
HQUSACE is Bob Fenlason, CEMP-RI, 202-761-8801, or e-mail:
bob.w.fenlason@usace.army.mil.
Questions and/or comments regarding this subject, should be directed to:
U.S. Army Engineer District, Mobile
ATTN: CESAM-EN-GE (Melissa Shirley)
P.O. Box 2288
Mobile, AL 36628-0001
Telephone: (251) 690-2616
Fax: (251) 690-2030
e-mail: melissa.l.shirley@sam.usace.army.mil
FOR THE COMMANDER:
DWIGHT A. BERANEK, P.E.
Chief, Engineering and Construction Division
Directorate of Civil Works
TABLE OF CONTENTS
Chapter
Page
1.
Introduction...................................................................................................................1
2.
Cross-Connection Control ...........................................................................................1
2.a
2.b
2.c
2.d
2.e
3.
Overview.............................................................................................................1
Health and Economic Significance.....................................................................1
Cross-Connections and Backflow.......................................................................2
Hazard Classification ..........................................................................................5
Methods of Backflow Prevention .....................................................................10
Overview of Federal Regulations ..............................................................................14
3.a
3.b
3.c
4.
Safe Drinking Water Act (SDWA) ...................................................................14
Overview of State Regulations .........................................................................18
Overview of US Army Regulations..................................................................19
Technical Guidelines and References .......................................................................21
4.a
4.b
4.c
US Army Guidelines.........................................................................................21
The US Army Center for Health Promotion and Preventive Medicine
(CHPPM) ..........................................................................................................24
Other Technical Guideline and Reference Sources ..........................................24
5.
Implementing an Effective Cross-Connection Control Program at US
Army Installations ...................................................................................................27
6.
Lessons Learned.......................................................................................................31
LIST OF APPENDICES
Appendix
A
B
Page
References..........................................................................................................A-1
Summary of State Cross-Connection Control Requirements ..............................B-
i
TABLE OF CONTENTS (continued)
LIST OF FIGURES
Figure
1
2
3
4
5
6
7
8
9
10
11
Page
Pressure Relationships ...........................................................................................3
Backsiphonage .......................................................................................................4
Backpressure Caused By Boiler ............................................................................6
Backpressure Caused By a Vacuum ......................................................................7
Backflow Caused By Heavy Demand....................................................................8
Air Gap.................................................................................................................11
Reduced Pressure Principle Backflow Prevention Device ..................................12
Double Check Valve Assembly Backflow Prevention Device............................13
Pressure Vacuum Breaker Backflow Prevention Device ....................................15
Atmospheric Vacuum Breaker Backflow Prevention Device .............................16
Variations of Backflow Prevention Devices........................................................17
LIST OF TABLES
Table
1
Page
Typical US Army Facilities and Hazard Classifications .......................................9
ii
1.
INTRODUCTION
a.
Under the Safe Drinking Water Act (SDWA), a water supplier is responsible for
preventing polluted or contaminated water, gas, or other substances from entering a public
drinking water system. US Army regulations mandate that potable water at all Army
installations meets the SDWA and State and local regulations. In addition, Army regulations
require particular methods and procedures be followed in the design, operation, and maintenance
of potable water systems, and mandate compliance with specific technical guidelines. The
development of an organized program that identifies, controls, and/or eliminates the
interconnections (cross-connections) between drinking water systems (potable) and other water
systems of questionable quality (nonpotable) is also required. To comply with these
requirements, a Cross-Connection Control Program must be developed, implemented, and
maintained.
b.
The purpose of this Public Works Technical Bulletin is to provide an overview of
cross-connection control and backflow prevention. Subjects discussed are the following:
2.
(1)
Health and operational implications of cross-connections for potable water
systems.
(2)
Causes of backflow, classification of hazards and methods of prevention.
(3)
Requirements for cross-connection control based on Federal, State and
Army regulations.
(4)
(5)
(6)
Technical guidelines and references for cross-connection control.
Key elements of a cross-connection control program.
Lessons learned from cross-connection control efforts at Army installations.
CROSS-CONNECTION CONTROL
a.
OVERVIEW
Drinking water is assumed to be safe. Advanced technology in water
treatment presumably provides high quality drinking water to the tap. To ensure this, it is
necessary that physical interconnections (cross-connections) between pipes containing safe
drinking water and other pipes containing water of questionable quality are eliminated or
protected against the possibility of reverse flow. If the questionable water was to enter the safe
drinking water, contamination or pollution may result. Surveillance of drinking water systems to
identify these interconnections is essential and regulatory. Piping and plumbing systems are
continually being installed, repaired, altered, or extended. A program of cross-connection
control is imperative to protect the health of the consumer. Additionally, legal implications may
be involved since it is the water supplier’s responsibility to provide safe drinking water to the
consumer.
b.
HEALTH AND ECONOMIC SIGNIFICANCE
(1) It is possible for drinking water systems to carry dangerous bacteria,
chemicals, or other substances that can cause harm to humans. There are numerous documented
cases of injuries and illnesses that have occurred during the past century resulting from the
backwards flow of polluted or contaminated water into the drinking water system. A classic
example of illness and even death as a result of cross-connections occurred in Chicago in 1933
where 1,409 persons contracted amebic dysentery from contamination through old, defective,
and improperly designed plumbing systems and equipment. Of those people, 98 died. More
recently, in 1985, 352 soldiers became ill and 163 were hospitalized with acute gastroenteritis at
a military installation. An investigation of the suspected source, a military dining facility,
revealed no specific food as the source of contamination. However, numerous unprotected
crossconnections were identified in the facility during the investigation. Recent problems with sewer
drainage in the food preparation area, and the unprotected cross-connections found during the
investigation, were suspected to have been the source and the mechanism for transference.
(2) Although always of highest concern, the impact of contamination in potable
water systems resulting from backflow is not solely a health-related issue. It can also be very
costly and time-consuming to remediate. In a small Southwest Virginia community, the
pesticide chlordane entered a water main by backflow through a hose connection and household
plumbing. As chlordane adheres to soil to prevent groundwater contamination, it did the same
inside the pipes and all fixtures it contacted. Flushing could not remove the chemical from the
mains or the plumbing. Several thousand feet of main had to be replaced as well as the service
lines, household plumbing, water heaters, clothes washers, and dishwashers. The chlordane
incident did not result in any reported health problems but cost the community more than $40
million.
(3) At a military installation in 1990, a faulty valve in a roof-mounted airconditioning unit allowed freon to be siphoned into the potable drinking water piping within the
building. Fortunately, the yellowish color of the water at a drinking fountain was discovered in
the early morning by an employee who notified his supervisors. Signs and hazard identification
tape were immediately placed at all drinking fountains in the building. Samples were taken of
the water from the fountains and analyzed for contaminants. A program of consistent flushing of
all potable water lines within the building began and continued for almost a year before the
levels of contamination in the drinking water were below those recommended by Federal and
State Drinking Water Standards. These and other cases where contamination or illness has
resulted from cross-connections have lead to increased requirements to ensure water distribution
and plumbing systems remain safe from contamination due to potential cross-connections.
c.
CROSS-CONNECTIONS AND BACKFLOW
(1) A "cross-connection" is the link through which it is possible for a source of
contamination or pollution to enter the potable (drinking) water system. There are two essential
factors needed before backflow can occur. First, there must be a link (cross-connection) between
two systems, one potable and the other non-potable (water of questionable quality). Second,
there must be a force that will move non-potable water toward the potable water. This force in
water pipes is caused by pressure or pressure differential. The force (pressure) produces motion.
Hence, the liquid in a pipe that has the higher pressure will move toward the liquid in a pipe that
has the lower pressure (see Figure 1). In cross-connection control terminology, this is called
"backpressure."
(2) Another "force" factor is vacuum. Reduced or negative pressure is created
when pressure drops below that of the atmosphere. This is commonly called "negative
pressure." When negative pressure occurs, atmospheric pressure is exerted on a liquid forcing it
toward the lowest point of pressure. This creates a siphoning effect, sucking the nonpotable
2
liquid, to the point of lowest pressure. In cross-connection control terminology, this is called
"backsiphonage" (see Figure 2).
(3) In summary, backflow is the reverse flow of a liquid caused by either
backpressure or backsiphonage. As an example, backpressure can be caused by an increase in
pressure above that of the potable water system, such as in a pressurized boiler or other vessel
(see Figure 3). Backsiphonage can be caused by a vacuum created when a pipe breaks (water
main break) or when a valve is left open somewhere downstream in a pipeline (see Figure 4).
It can also be caused by heavy demand, such as a fire pumper truck pulling water from a hydrant
during fire-fighting operations (see Figure 5).
d.
HAZARD CLASSIFICATION
(1) Cross-connections are classified by the degree of hazard presented by the
downstream nonpotable system or equipment served by a supply of potable water. The degree of
hazard increases as the probability of backflow or the toxicity of a substance in the nonpotable
system or equipment increases. However, the risk associated with a substance's toxicity is
always more of a concern than the probability of backflow.
(2) Although some minor differences in the definitions of the degree of hazard
may exist in regulations and technical guidance documents related to cross-connection control,
the degree of hazard is generally classified as Minor/Low, Moderate/Medium, and Severe/High.
In Army guidance documents to be further discussed later, the classification (degree) of hazards
are defined as follows (in accordance with MIL-HDBK-1164):
(a)
(b)
(c)
(3)
Class 1 - Minor/Low Degree of Hazard
•
The contaminant would only slightly degrade the aesthetic
quality of the water, i.e., taste, odor, or color.
•
A health hazard would not exist.
•
The contaminant would not disrupt service of piped water.
Class II - Moderate/Medium Degree of Hazard
•
The contaminant would significantly degrade the aesthetic
quality of the water or impair the usefulness of the water.
•
A health hazard would not exist.
•
The contaminant would not seriously disrupt service of piped
water for drinking or domestic use.
Class III - Severe/High Hazards
•
The contaminant would be toxic, poisonous, noxious, or
unhealthy.
•
A health hazard would exist. If the contaminant were consumed
by humans, it could result in illness or death.
•
The contaminant would disrupt service of piped water for
drinking or domestic use.
The degree of hazard determines the type of backflow
prevention device to
be installed. If the degree of hazard is questionable, it must be assumed that the
cross-connection is Class III. A list of buildings representative of those facilities
typical to Army installations and the potential cross-connection
classification/degree of hazard each presents to the potable water distribution
system, is provided in Table 1.
5
TABLE 1
TYPICAL US ARMY FACILITIES AND HAZARD CLASSIFICATIONS
Facility
Classification/Degree Of Hazard
Administrative Offices
Class I/Low
Air Conditioning Plants
Class III/High
Aircraft Maintenance Shops
Class II-to-III/Moderate-to-High
Arts and Crafts Facilities
Class I-to-II/Low-to-Moderate
Barracks
Class I/Low
Bath Houses
Class III/High
Child Care Facilities
Class III/High
Clubs w/beverage bars and dining facilities Class II-to-III/Moderate-to-Low
Dental Clinics
Class III/High
Dining Facilities
Class III/High
Elementary Schools
Class I/Low
Family Housing
Class I/Low
Fueling Stations
Class III/High
Guest Houses
Class I-to-II/Low-to-Moderate
Gymnasiums
Class I-to-III/Low-to-High
Hazardous Waste Storage Facilities
Class III/High
Heating/Boiler Plants
Class III/High
High Schools
Class I-to-III/Low-to-High
Insecticide Herbicide Shops
Class III/High
Intermediate Schools
Class I-to-III/Low-to-High
Kennels
Class III/High
Laundries/Dry Cleaning Plants
Class II-to-III/Moderate-to-High
Medical Clinics
Class III/High
Military Schools
Class I-to-III/Low-to-High
Museums
Class I-to-III/Low-to-High
Optometry Clinics
Class III/High
Photography Laboratories
Class I-to-III/Low-to-High
Religious Activity Facilities
Class I-to-III/Low-to-High
Resource Recovery Plants
Class III/High
Small Arms Repair Shops
Class III/High
Stables
Class III/High
Swimming Pools
Class III/High
Trade Shops
Class I-to-III/Low-to-High
Vehicle Maintenance Shops
Class II-to-III/Moderate-to-High
Vehicle Washing Facilities
Class II-to-III/Moderate-to-High
Veterinary Clinics
Class III/High
Warehouses
Class I/Low
Wastewater Pumping/Lift Stations
Class III/High
Wastewater Treatment Plants
Class III/High
Water Booster Pumping Stations
Class I-to-III/Low-to-High
Water Treatment Plants
Class III/High
9
e.
METHODS OF BACKFLOW PREVENTION
Prevention of backflow can be accomplished by either using an air gap or a
mechanical device specifically designed to prevent backflow. Selection of the method or device
is dependent on the potential degree of hazard presented by the downstream nonpotable water
system. The hazard results from pollutants or contaminants that are likely to taint the potable
water in the event that backflow were to occur as a result of either backsiphonage or
backpressure. These methods and devices are further discussed below and illustrated in figures
presented.
(1)
Air Gap
The first method is a physical separation between the potable water pipe and
the nonpotable water pipe, commonly refereed to as an "air gap" (see Figure 6). Air gaps are
non-mechanical and provide the most reliable means of prevention. An air gap: Can be used
regardless of pressure conditions or the degree of hazard; Is commonly used at the end of a pipe
that supply reservoirs, tanks, or other open top vessels; Is 100 percent effective, so long as it
cannot be bypassed or defeated; Must be twice the diameter of the potable water supply pipe, but
never, in any situation, less than one inch. As an example, the air gap between a 4-inch pipe
supplying a swimming pool must be at least 8-inches above the highest overflow level of the
pool.
(2)
Backflow Prevention Devices
(a) The second method is by using mechanical devices installed between
the potable and nonpotable water pipes to stop the reverse flow of a liquid. The devices are
called "backflow prevention devices" or "backflow preventers." They are designed and
manufactured specifically for the purpose of preventing backflow. There is a wide selection of
backflow prevention devices, in a variety of sizes, available on the commercial market.
However, there are four basic types of mechanical devices, as follows:
•
The Reduced Pressure Principle (RP) device or Reduced
Pressure Zone (RPZ) (see Figure 7). The RP is used to protect a water system from pollutants or
contaminants that would constitute a hazard to the health of the consumer. It consists of two
independently operating, spring-loaded check valves with a reduced pressure zone between the
check valves and a pressure relief valve on the underside of the device. The RP:
-
Protects against both backsiphonage and backpressure.
-
Protects against all degrees of hazard.
-
Can be subjected to continuous supply pressure (defined as
constant pressure for more than 12 hours per day).
•
The Double Check Valve (DCV) assembly (see Figure 8). The
DCV is used to protect a water system from pollutants or contaminants that would not constitute
a health hazard, but might be objectionable insofar as color, odor, or taste. It consists of two
independently operating, spring-loaded or internally weighted check valves. The DCV:
-
Protects against both backsiphonage and backpressure.
-
Protects against a low degree of hazard only.
-
Can be subjected to continuous supply pressure.
10
•
The Pressure Vacuum Breaker (PVB) (see Figure 9). The PVB can be used to protect
against a health hazard. However, if used to protect from a health hazard, consideration must be
given to the possibility of the device being bypassed. It consists of one or two independently
operating, spring-loaded check valves and an independently operating, spring-loaded air inlet
valve. The PVB:
-
Protects against backsiphonage only.
-
Protects against all degrees of hazard but is generally
recommended for protection against non-health hazards
only.
-
Can be subjected to continuous supply pressure.
•
The Atmospheric Vacuum Breaker (AVB) (see Figure 10). The
AVB can be used for protection against health hazards; however, as with the PVB, if the AVB is
used to protect from a health hazard, consideration must be given to the possibility that the
device may be bypassed. It consists of a float check valve, seat check valve, and an air inlet
port. The AVB:
-
Protects against backsiphonage only.
-
Is generally recommended for protection against non-health
hazards only.
-
Cannot be subjected to continuous supply pressure (i.e.,
cannot be subjected to constant pressure for more than 12
hours per day).
(b) In addition to these four basic devices, there are several variations of
each type designed for specific applications, such as a vending machine or a laboratory faucet
(see Figure 11).
3.
OVERVIEW OF FEDERAL REGULATIONS
a.
SAFE DRINKING WATER ACT (SDWA)
(1) Under the provisions of the SDWA of 1974 and the Amendments of 1986
and 1988, the Federal Government established national standards for safe drinking water.
Individual states are responsible for enforcing these standards and overseeing public water
systems. A water purveyor (supplier) is responsible for complying with the provisions of the
SDWA. This includes ensuring water meets the safe drinking water standards and its quality is
not compromised during delivery to the consumer through the distribution system. Applicable
sections of the SDWA as enacted as Title XIV of the Public Health Service Act, is found at 42
United States Code §§ 300f-300j-26, Safety of Public Water Supplies, as follows:
(a) Section 1412 - National Drinking Water Regulations . "National
interim primary drinking water regulations promulgated under paragraph (1) shall protect health
to the extent feasible using technology, treatment techniques, and other means, which the
Administrator determines are generally available (taking costs into consideration) on the date of
enactment of this title."
14
(b)
Section 1431 - Emergency Power. "(A) Not withstanding any other provision of this
title, the Administrator, upon receipt of information that a contaminant that is present or is likely
to enter a public water system, may present an imminent and substantial endangerment to the
health of persons, may take such actions as he may deem necessary in order to protect the health
of such persons."
(2) Occupation Safety and Health Administration (OSHA). The OSHA Act of
1970 requires, in part, that every employer covered under the Act provide employment and a
place of employment which are free from recognized hazards that are causing or are likely to
cause death or serious physical harm to his employees. The applicable section of 29 Code of
Federal Regulations (CFR), Part 1910, the Occupational Safety and Health Standards, is Subpart
J - General Environmental Controls, Section 1910.141 - Sanitation.
b.
-
Water supply
-
Non-potable water. Construction of nonpotable water
systems or systems carrying any other nonpotable
substance shall be such as to prevent backpressure or
backsiphonage into a potable water system.
OVERVIEW OF STATE REGULATIONS
(1) In the past decade, the protection of potable water from the potential of
backflow has moved forward in priority for state regulatory authorities. This has been accented
by the adoption and enforcement of regulations focusing on the elimination of cross-connections
and/or their control by the installation of backflow prevention devices, the establishment and
implementation of specific management programs, and updated or revised plumbing and
building codes to reflect cross-connection control.
(2) A brief description of State rules and regulations applicable to crossconnection control and backflow prevention is provided in Appendix B. Appendix B also
includes a matrix that summarizes whether certain aspects of cross-connection control and
backflow prevention are recommended or mandatory in specific states. More detailed
information related to each state's cross-connection control requirements is available from the
Installation Support Center (ISC) of the US Army Corps of Engineers.
(3) The current status and key aspects of state cross-connection control
regulations is summarized below.
(a) A total of 47 states have specific or applicable regulations for crossconnection control and backflow prevention. Of those not having specific regulations, plumbing
codes have been adopted within these states that require cross-connection protection at specified
water outlets, plumbing fixtures, and/or particular water using equipment. Additionally,
installation methods, maintenance, and testing requirements are also specified in the codes.
Therefore, a framework for cross-connection control exists in every state in the nation.
(b) Regulations, codes, standards, and guidelines are consistently being
revised and updated, as are frequent changes in which state agency or individual within an
agency is designated with the responsibility for enforcement of cross-connection control
regulations. The extent of cross-connection regulations in various states ranges from a single
paragraph to comprehensive requirements comprised of several hundred pages.
18
(c) The US Environmental Protection Agency (EPA) is currently
considering the promulgation of federal or state-mandated regulations requiring a crossconnection control program (Federal Register, July 29, 1994).
(d) A total of 24 states mandate the establishment and implementation of a
written cross-connection control program or plan. Additionally, the majority of those states also
require approval of program or plan by the applicable regulatory authority prior to
implementation, and specify key elements that must be contained within.
(e) The majority of states with cross-connection regulations commonly
provide specific technical guidelines within the regulations, have prepared and published in-state
guidelines, or specify, adopt, or refer to guidance manuals produced and published by the
American Water Works Association (AWWA), the Foundation for Cross-Connection Control
and Hydraulics Research (FCCCHR), and/or the American Society of Sanitary Engineering
(ASSE).
(f) The majority of states do not approve or disapprove the types of
backflow prevention device that can be used. However, third party approvals, such as those
granted by the ASSE and FCCCHR, are the most commonly accepted and specified.
(g) A total of 38 states with cross-connection control regulations specify
particular installation requirements for backflow prevention devices. In addition, plumbing
codes also generally specify backflow prevention device installation requirements. When
regulations within a particular state require specific installation methods, the majority
differentiate between containment (installation of devices in a buildings water service main) and
isolation percent of the states with cross-connection control regulations require the installation of
backflow prevention devices in fire sprinkler systems.
(h) All states with cross-connection control regulations require backflow
prevention devices to be tested. These requirements range from a basic statement saying that the
devices must be tested, to specifying particular testing frequencies. In addition, several states
specify different testing frequencies for different types of backflow prevention devices.
(i) A total of 31 states with cross-connection control regulations mandate
certification of persons who test backflow prevention devices. Several states require testers to be
licensed plumbers or contractors. Some states do not specify certification or licensing of testers,
however, repair of such devices must be performed by licensed plumbers. Other states have
requirements for certification of testers for those devices installed as containment protection, but
tests on devices installed for isolation purposes must be performed by licensed plumbers.
c.
OVERVIEW OF US ARMY REGULATIONS
The Army Regulations described in more detail below, are the impetus for crossconnection control in the Army. In summary, these regulations:
•
Require compliance with federal, state, and local regulations.
•
Prohibit cross-connections.
•
Require the establishment of a cross-connection control program.
•
Prescribe installation management principles and responsibilities.
•
Specify the technical manuals to be followed.
•
19
Provide additional sources of information for cross-connection control and
backflow prevention.
(1)
AR 200-1, Environmental Protection and Enhancement, February
1997
•
This regulation has been recently updated and provides an
overview of the US Army's environmental programs and requirements. Additionally, it
identifies key management controls for guarding and improving the environment and assigns
responsibilities for the management of natural resources. It applies to Active Army, Army
National Guard, US Army Reserve, civil works activities under the jurisdiction of the US Army
Corps of Engineers, tenants, other Federal agencies, contractor activities, and supporting lessee
activities located on real property under the jurisdiction of the US Army.
•
Key elements of AR 200-1 applicable to cross-connection
control are found in Chapter 2, Water Resources Management Program. In summary, this
chapter states the Army will:
(2)
-
Provide drinking water to fixed facilities in accordance
with the requirements of the SDWA and applicable state
and local regulations, including plans and programs to
safeguard water quality and quantity, both at the source and
in the distribution system.
-
Obtain and comply with all required waterworks permits.
-
Identify and implement pollution prevention initiatives.
AR 420-49, Utility Services, April 1997
•
This newly revised regulation has consolidated the following
seven previously issued regulations into one:
-
AR 420-15 - Certification of Utility Plant Operators and
Personnel Performing Inspection and Testing of Vertical
Lift Devices.
-
AR 420-43 - Electrical Services.
-
AR 420-46 - Water Supply and Wastewater.
-
AR 420-47 - Solid and Hazardous Waste Management
-
AR 420-49 - Heating, Energy Selection and Fuel Storage,
Distribution, and Dispensing Systems.
-
AR 420-54 - Air-Conditioning and Refrigeration.
-
AR 420-55 - Food Service and Related Equipment.
•
The new regulation, in Chapter 4 - Water Supply and
Wastewater, establishes the Army's policy and criteria for the operation, maintenance, repair, and
construction of distribution, collection, treatment, and disposal facilities for water supply,
wastewater, stormwater, and industrial waste. This regulation stipulates that:
-
20
Potable water will be supplied in accordance with the
SDWA and all applicable state and local regulations.
-
Sanitary control and surveillance of potable water supplies
will be in accordance with AR 40-5 and Technical Bulletin
(TB) Medical (MED) 576 or applicable state and local
regulations.
-
Operation, maintenance, and repair of water supply systems
will be in accordance with MIL-HDBK-1164.
•
More specifically, paragraph 4-7, Water Supply, Treatment, and
Surveillance, specifies that Army installations located within states that have been granted
primary enforcement responsibility by the Environmental Protection Agency (EPA) will comply
with the state's regulations. Additionally, paragraph 4-7 k., states: "A cross-connection control
program will be established at each installation. Cross-connection control plans will be prepared
to regulate those areas in the distribution system where potable water may come in contact with
nonpotable water. The plan will list the existing and potential cross-connections and develop a
plan for the installation of backflow prevention devices, as well as a schedule for testing,
inspection, and maintenance. A routine inspection and maintenance program for backflow
prevention devices performed by State certified personnel will include backflow prevention
devices for those facilities that have the potential to contaminate the water supply system (for
example, pest control shops, photographic laboratories, and medical facilities). Design,
operation, and maintenance of cross-connection control components will be in accordance with
TM 5-660 and TB MED 576."
(3) AR 40-5, Preventive Medicine, June 1985. This regulation provides
the Army's policy, guidelines, procedures, and actions required for preserving and promoting
health and preventing disease and injury. Chapter 12, Sanitation, Section 12-2, paragraph f.,
Cross-Connections, states: "Cross-connections between potable and nonpotable distribution
systems are not permitted. TB MED 576 and MIL-HDBK-1164 discuss cross-connection and
provide proper references. The current National Standard Plumbing Code will be followed in
the testing, maintenance, and renovation of water distribution systems and in the selection of all
plumbing fixtures."
(4) AR 5-3, Installation Management and Organization, 1992. This
regulation establishes an organization framework for Army installations, describes management
principles and responsibilities, provides commanders with signature authority to delegate
responsibility and the flexibility to structure installation staff to achieve maximum effectiveness.
4.
TECHNICAL GUIDELINES AND REFERENCES
There are several technical guidelines and references available for cross-connection
control and backflow prevention. Those most frequently referenced or specified, with particular
emphasis placed on the relevant sections, are described below.
a.
US ARMY GUIDELINES
In accordance with US Army Regulations previously described, several Technical
Manuals (TMs) and Military Handbooks (MIL-HDBKs), described in more detail below,
provide guidance related to cross-connection control and backflow prevention. They detail the
construction, operation, maintenance, repair, and surveillance of potable water supply and
distribution systems at Army installations. In summary, these technical guidelines:
•
21
Prohibit interconnections between potable water and sanitary sewer systems.
•
Require an organized program of cross-connection control.
•
Require inspections to identify and eliminate cross-connections, and prevent
backsiphonage.
•
Require instruction in cross-connection control, and backflow prevention
methods.
•
Reference particular sources of additional information for cross-connection
control and backflow prevention.
•
Describe hazard classifications and degrees of hazard.
•
List the types of backflow prevention devices which can be used for each
particular hazard classification.
•
Describe the functions of, and list, the types of approved backflow
prevention devices that can be used.
•
Describe backflow prevention device installation practices.
•
List and describe backflow prevention methods that are not approved for
use.
•
List inspection, testing, and maintenance procedures and schedules for
backflow prevention devices in particular hazard classifications.
•
Describe record keeping requirements and procedures for cross-connection
control and backflow prevention devices.
(1) TB MED 576, Sanitary Control and Surveillance of Water Supplies at
Fixed Installations, March 1982. Chapter 4, Water Distribution Systems, in summary, states
that:
•
No interconnection between a potable water distribution system
and a sanitary sewage system shall be permitted.
•
Each installation shall undertake an organized program that
includes instruction, inspection, and required improvements in
order to detect and remove all potential and existing crossconnections, and to ensure that proper measures (e.g., air gaps
and backflow prevention devices) are taken to prevent
backsiphonage.
•
EPA Publication 430/9-73-002 and AWWA Publication No.
20106 provide excellent information for cross-connection
control.
(2) MIL-HDBK-1164, Operation and Maintenance of Water Supply
Systems, 3 March 1997. Section 10, Cross-Connection Control and Backflow Prevention,
provides specific guidelines for the control of cross-connections by the use of backflow
prevention devices. Subsections of this technical reference contain:
•
22
General information on backflow prevention devices and crossconnection control.
•
Specific information on degree of hazard classifications and
approved types of backflow prevention devices for the degree of
hazard.
•
Descriptions of each approved type of backflow prevention
device.
•
Backflow prevention device installation practices (for each
specific type).
•
Descriptions of unapproved methods and devices.
•
Frequencies of testing and inspecting backflow prevention
devices.
•
Maintenance of backflow prevention devices.
•
Record keeping procedures.
(3) TM 5-813-1, Water Supply Sources and General Considerations, June
1987. Chapter 2, Water Requirements, Section 2-3 a., provides specific guidelines for the
control of cross-connections and installation of backflow prevention devices. Subsections of this
technical reference contain:
•
A statement prohibiting cross-connections.
•
Backflow prevention device requirements for irrigation systems.
•
The plumbing code which must be followed in the installation of
backflow prevention devices.
•
The types of check valves that cannot be used.
(4) TM 5-813-5, Water Supply, Water Distribution, November 1986.
Chapter 1, General, Section 1-4, Cross-Connections, provides cross-connection control
guidelines as summarized below.
•
Separate distribution systems must be used to deliver water if
fires are to be fought with both potable and nonpotable water.
•
Fire-fighting reservoirs that are filled with both potable and
nonpotable water shall be filled with potable water only through
a 12-inch air gap.
•
Pump seal water must be stored in a tank with an air gap at the
end of the potable supply line and the top of the tank.
•
23
Air gaps should be at least twice the diameter of the water supply
line.
•
Reduced Pressure Principle backflow prevention devices should
meet the criteria of the American Water Works Association
Standard C506.
•
Double Check Valves for backflow prevention are not
considered suitable and should not be used.
•
Backsiphonage can be prevented with air gaps, atmospheric
vacuum breakers, or pressure vacuum breakers.
b. THE US ARMY CENTER FOR HEALTH PROMOTION AND PREVENTIVE
MEDICINE (CHPPM)
This agency, formerly the US Army Environmental Hygiene Agency, prepared a
document titled "Information Paper No. 42, Cross-Connection Control and Backflow
Prevention," in August 1987. This document provided general and specific information as
follows:
c.
•
Cross-connections and the causes of backflow.
•
The types of devices available for controlling cross-connections and
preventing backflow.
•
Guidance for development of a cross-connection control program.
•
A suggested protocol for the conduct of a cross-connection control survey.
OTHER TECHNICAL GUIDELINE AND REFERENCE SOURCES
(1) US Environmental Protection Agency (USEPA). The document titled
"Cross-Connection Control Manual," Publication 430/9-73-002, was published originally in
1973, and reprinted in the two following years and again in 1989. This document provides:
(a)
Descriptions of cross-connections and the causes of backflow, theory
of backflow and backsiphonage, health aspects and case histories of
backflow.
(b)
Descriptions, methods, and devices for the prevention of backflow
including illustrations of backflow and backflow prevention devices.
(c)
Procedures for testing backflow prevention devices.
(d)
Requirements for the administration of a cross-connection control
program.
(e)
Plumbing hazards associated with cross-connection control.
(f)
Illustrations of backflow and backflow prevention devices.
(g)
Samples of record keeping forms.
24
(2) American Water Works Association (AWWA) The document titled
"Recommended Practice for Backflow Prevention and Cross-Connection Control," Manual M14,
is one of the American Water Works Association's many technical guidelines in the series of
Manuals of Water Supply Practices. Manual M14 was originally produced in 1966 (Second
Edition). It was last revised in 1990 and is one of the most widely used references in the
industry. This document provides:
(a)
Descriptions of the administration requirements, responsibilities,
authority, enforcement, education, and record keeping necessary for
developing and implementing a cross-connection control program.
(b)
Definitions and descriptions of backflow principles.
(c)
Descriptions of hazard classifications and backflow control methods.
(d)
Lists of typical hazards, cross-connections, and the recommended type
of protection.
(e)
Descriptions of backflow prevention in fire protection systems and
recommended type of protection.
(f)
Descriptions and detailed procedures for maintenance and testing of
backflow prevention devices.
(3) Foundation For Cross-Connection Control And Hydraulics Research
(FCCCHR). The document titled "Manual of Cross-Connection Control," produced by the
University of Southern California (USC), was last revised and published in December 1993
(Ninth Edition). It is one of the most widely used references in the industry. The information
provided in the manual is similar to that in the AWWA manual. However, it is more detailed
and contains specific information as follows:
(a)
Descriptions and illustrations of backflow prevention devices.
(b)
Descriptions and illustrations of typical and specific types of crossconnections found in general industry.
(c)
Recommendations for the type and location of backflow prevention
devices needed to protect the public water system from crossconnections.
(d)
Detailed and illustrated backflow prevention device maintenance and
testing procedures.
(e)
Design, material, and performance specifications for backflow
prevention devices.
(4) The FCCCHR, USC testing laboratory is one of the most recognized
organizations for the approval of the design, material, and performance of backflow prevention
devices.
(5) National Standard Plumbing Code (NSPC). The National Standard
Plumbing Code (NSPC), 1996, is published by the National Association of Plumbing-HeatingCooling Contractors (NAPHCC), Falls Church, Virginia. This particular code book is widely
used throughout the United States. It was developed as a recommended code of plumbing
25
practice, design, and installation, including performance criteria based on the need for safety and
health. The code does not have legal standing unless it is adopted by reference or inclusion in
state, county, or municipal government statutes or regulations.
(6) Several chapters of the NSPC have requirements for backflow protection on
particular types of plumbing fixtures, equipment, or systems. However, there are chapters that
specifically describe and detail cross-connection control and backflow prevention requirements.
Applicable chapters of its contents are summarized as follows:
(a)
(b)
Chapter 10, Water Supply and Distribution:
•
Requires potable water supplies to be protected against crossconnections.
•
Requires cross-connection control by containment and isolation.
•
Requires backflow prevention devices on plumbing fixtures,
appliances, and water supply outlets.
•
Lists requirements for types of backflow prevention devices
according to degree of hazard and pressure conditions.
•
Requires specific backflow prevention device installation
locations and methods.
•
Requires backflow prevention device testing and maintenance
frequencies.
•
Requires certification of backflow prevention device testers and
describes training requirements.
•
Describes backflow prevention devices for tanks, vats,
carbonated beverage machines, fire systems, lawn sprinklers and
irrigation systems, heat exchangers, hose connections and special
equipment.
Chapter 14, Special Requirements for Health Care Facilities:
(c)
•
Requires cross-connection control and backflow prevention.
•
Requires specific types of backflow prevention devices for
specific types of medical equipment.
Chapter 17, Potable Water Supply Systems:
•
Prohibits cross-connections between public potable water
supplies and private water supplies.
(7) American Society of Sanitary Engineering (ASSE) Standards. The ASSE,
organized in the early 1900's, is an association of contractors, engineers, manufacturers,
inspectors, health officials, and other interested parties. The association developed the
"Standards" for plumbing system components used by plumbing code administrators nationwide.
These include, but are not limited to, performance requirements for:
•
26
Eight separate types of backflow prevention devices.
•
Water closet flush tank ball cocks.
•
Water pressure reducing valves.
•
Home and commercial laundry equipment and dishwashers.
•
Food waste disposal units.
•
Water hammer arresters.
•
Flow restrictors, traps, valves, and drains
(8) The ASSE Standards are the most often referenced in State regulations,
prior to their meeting approval for use in a particular state.
(9) In addition to the development and publication of Standards, the ASSE
offers the following certification programs:
•
Backflow Prevention Assembly Tester
•
Backflow Prevention Assembly Repairer
•
Cross-Connection Control Survey Inspector (under development).
(10) Furthermore, the ASSE offers several technical publications related to the
plumbing industry, including:
•
A booklet on the selection and use of backflow prevention devices.
•
A plumbing dictionary.
•
Plumbing inspector's manuals.
•
Technical training course refresher books.
•
Energy and water conservation guidelines and tips.
5.
IMPLEMENTING AN EFFECTIVE CROSS-CONNECTION CONTROL
PROGRAM AT US ARMY INSTALLATIONS
The water supplier has the responsibility to provide clean, safe water to the consumer.
To ensure protection against contaminants and pollutants, an effective program to control crossconnections is essential. The control of cross-connections is regulatory in nature and should be
implemented through the authority of Federal, State, and Army regulations previously discussed.
The implementation of a successful and effective cross-connection control program can
be performed in phases as described below.
(a) PHASE I - FORMATION OF A CROSS-CONNECTION CONTROL
COMMITTEE. Prior to implementation of a program, it is strongly suggested that a crossconnection control committee be formed. The committee should be comprised of
representatives from each of the following:
27
Installation Office
Purpose of Representation
Installation Command Representative
Establish policy.
Directorate of Public Works
Prepare and recommend policy; direct the
program.
Environmental Management
Provide guidance on current regulations.
Public Affairs Office
Assist in providing consumer education.
Staff Judge Advocate Office
Define legal procedures in implementing,
operating, and regulating the program.
(1) The primary purpose of the committee would be to establish policy and
provide guidance for the installation's overall cross-connection control program. Additional
duties of the committee could include:
•
Assigning program responsibilities, including operation, maintenance,
record keeping, and enforcement.
•
Approving policies and documents applicable to the program.
(2) It is also suggested that the committee meet regularly to determine the status
of the cross-connection control program and take any actions that may be necessary or required
to ensure the success and effectiveness of the program.
(b) PHASE II - DEVELOPMENT OF CROSS-CONNECTION CONTROL
POLICY. A policy statement or directive is a key element of an effective cross-connection
control program. It should contain the following general points:
(1) Legal Authority (which regulations establish the authority for the program) (For example: Pursuant to Chapter ___ of the State of ___________ Drinking Water
Regulations, Chapter 2 of AR 200-1, Chapter 4 of AR 420-49, and Chapter 12 of AR 40-5, Fort
__________ is responsible for protecting its drinking water by implementing and enforcing a
cross-connection control program).
(2) A purpose (why the policy is necessary) - (For example: to protect the water
system; to eliminate and control existing and potential hazards; to prevent future crossconnections).
(3) Requirements of the program, including: Responsibilities - (For example:
The DPW Utilities Branch is responsible for maintenance of the distribution system; the
consumer is responsible for avoiding any action which may cause pollutants or contaminants to
enter the potable water system ); Prohibitions - (For example: Cross-connections between the
potable water distribution system and non-potable water systems, equipment, fixtures, piping,
and outlets are prohibited)); Protection Required - (For example: An approved air gap
separation or backflow prevention device shall be installed on each potable water service line in
accordance with the installation's Cross-Connection Control Plan.); Inspections - (For example:
Authorized DPW representatives shall be permitted to enter all properties for the purpose of
inspection, observation, maintenance, and testing in accordance with the installation's CrossConnection Control Plan); Denial or Discontinuance of Service - (For example: Water service
28
shall be denied or discontinued if an unprotected cross-connection is determined to exist and
appropriate corrective actions have not been taken after official receipt of notification); and
Effective Date - (For example: This policy shall be in effect as of (date) ).
(c)
PHASE III - PREPARATION OF A CROSS-CONNECTION CONTROL PLAN
(1) Implementing an effective and successful cross-connection control program
should be complemented by the preparation of a plan of action, specifically, a Cross-Connection
Control Plan. The plan should provide detailed guidance for installation personnel, contractors,
and consumers. It should:
•
Incorporate policy and authority statements.
•
Identify responsibilities and outline the cross-connection control
program chain-of-command.
•
Describe the purpose and scope of the program.
•
Describe cross-connections and backflow prevention methods and
devices.
•
Establish procedures for installing, testing and maintaining the
devices.
•
Establish and describe procedures for containment of contamination or
pollution and notification of water users should backflow contaminate
the potable water system.
•
Describe record keeping requirements.
•
Define terminology.
(2) The DPW should be responsible for the Cross-Connection Control Plan
since this Directorate will have the major responsibility for management of the installation's
cross-connection control program. Divisions, branches, sections, and trade shops under the
direction of the DPW that will have program responsibilities usually include:
•
Operation and Maintenance Division
•
Utility Branch, to include:
-
•
Interior and Exterior Plumbing
Heating, Ventilation, Air Conditioning, and Refrigeration
Water and Wastewater Treatment Sections
Engineering Plans and Services Division
(3) The plan should be prepared based on current regulations, in accordance
with AR 420-49, paragraph 4-7 f. Individual state regulations may require particular elements
that must be included. It is suggested that the regulations be reviewed prior to preparation of the
plan.
(4) All representatives of the Cross-Connection Control Committee should
review the Cross-Connection Control Plan. The installation's Divisions, Branches, and
29
Departments having responsibilities for the cross-connection control program should also review
the Plan, become familiar with its requirements, and accept the responsibilities as assigned.
(d)
PHASE IV - CONDUCT OF CROSS-CONNECTION SURVEYS
(1) A major element of a cross-connection control program is the survey and
inspection of facilities, buildings, nonpotable water systems, plumbing equipment, fixtures, pipes
and outlets. This is imperative for identifying existing and potential cross-connections,
assigning a hazard classification to each, and determining the method or device required to
eliminate or prevent backflow. Procedures to accomplish this task must be included in the
Cross-Connection Control Plan and should include initial and follow-on inspections. Crossconnections are ever present dangers that appear in subtle forms and in unsuspecting places.
New cross-connections are formed every day through new construction, renovations, and
extensions of plumbing and piping systems. Even the most subtle form of cross-connection, the
garden hose, can change the degree of hazard from low-to-high by the simple connection of the
hose to a faucet, depending on surrounding circumstances.
(2) Commonly, private engineering firms have been contracted to conduct
initial surveys to identify cross-connections and recommend corrective actions necessary to
eliminate or control potential hazards.
(3) The tasks generally associated with initial cross-connection control efforts at
Army installations typically include:
•
Building Surveys - Conducting a building survey to identify existing
and potential unprotected cross-connections, and existing backflow
prevention devices and generally consists of:
-
Tracing the potable water piping systems in, and throughout,
each selected building.
-
Identifying nonpotable water systems, uses, equipment, and
fixtures.
-
Identifying existing and potential interconnections (crossconnections) between the potable and nonpotable systems,
equipment, and fixtures.
-
Determining the risk (class/degree of hazard, potential pollutant
or contaminant) of each cross-connection, or the nonpotable
water use, presents to the potable water distribution system in the
event backflow should occur.
-
Deciding the type of protection (facility containment and/or
point-of-use isolation) and particular type of backflow
prevention device that is required to properly protect the potable
water system and/or the building's internal plumbing from the
existing or potential hazard(s).
-
Identifying previously installed
backflow prevention devices, pressure testing those devices
equipped with test instrument connections, inspecting devices for
adequacy according to the potential class/degree of hazard, and
installation methods that comply with regulations and plumbing
codes or follow standards and technical guidelines.
30
6.
•
Survey Report - Preparing a report of the results of the building
surveys, including necessary and recommended corrective actions,
and estimated costs for correcting the deficiencies identified.
•
Training - Providing classroom and hands-on cross-connection
control and backflow prevention technical training to military and
civilian workers.
LESSONS LEARNED
Cross-connection control and backflow prevention programs have been implemented at
various Army installations nationwide. A review of these cross-connection control efforts and
experiences in conducting surveys at selected Army Installations has allowed the identification
of several "lessons learned" which are summarized below:
a.
Approximately 90% of the total cross-connections identified are unprotected;
only 10% have existing devices installed to protect against backflow.
b.
Approximately 95% of unprotected cross-connections require backflow
protection; only 5% can be eliminated.
c.
There are an average of 5 cross-connections in each building surveyed.
Therefore, approximately 5 backflow prevention devices are required per
building.
d.
The majority of buildings and plumbing systems at Army installations were
designed, constructed, and installed prior to the implementation of more stringent
laws, regulations, and codes for cross-connection control and backflow
prevention.
e.
Plumbers on Army installations are usually not licensed and trained according to
State requirements.
f.
Existing backflow prevention devices in the distribution system are generally
ignored once installed and seldom inspected, tested, or maintained. The lack of
maintenance generally results in replacement versus repair, and ultimately,
increased maintenance costs.
g.
Installation of devices according to regulations, guidelines, and plumbing codes is
rare. The devices are found installed against ceilings, walls or floors, in confined
spaces, and directly over top of electrical equipment, making access difficult
and/or dangerous.
h.
As-built drawings are, for the most part, not up-to-date. Piping valve charts are
rarely available and frequently do not reflect current conditions. In older
buildings, piping is generally not color-coded or marked.
31
APPENDIX A
REFERENCES
1.
Title XIV of the Public Health Service Act, 42, United States Code §§ 300f-300j-26,
Safety of Public Water Supplies, Public Law (PL) 93-523, Safe Drinking Water Act
(SDWA), 16 December 1974; plus 1986 amendments (Public Law (PL) 99-399).
2.
Title 29, Code of Federal Regulations (CFR), Part 1910, Occupational Safety and Health
Standards
3.
AR 200-1, Environmental Protection and Enhancement, Department of the Army, 21
February 1997.
4.
AR 420-49, Utility Services, Department of the Army, 28 April 1997.
5.
AR 40-5, Preventive Medicine, Department of the Army, 14 June 1985.
6.
AR 5-3, Installation Management and Organization, Department of the Army, 1992.
7.
TB MED 576, Sanitary Control and Surveillance of Water Supplies at Fixed Installations,
Department of the Army, March 1982.
8.
MIL-HDBK-1164, Operation and Maintenance of Water Supply Systems, 3 March 1997.
9.
TM 5-813-1, Water Supply Sources and General Considerations, Headquarters,
Departments of the Army, the Navy, and the Air Force, 4 June 1987.
10.
TM 5-813-5/AFM 88-10, Volume 5, Water Supply, Water Distribution, Department of
the Army, November 1986.
11.
Information Paper No. 42, Cross-Connection Control and Backflow Prevention, US
Army Environmental Hygiene Agency (AEHA), August 1987.
12.
Publication 430/9-73-002, Cross-Connection Control Manual, US Environmental
Protection Agency, 1989.
13.
Manual of Practice M14, Recommended Practice for Backflow Prevention and CrossConnection Control, American Water Works Association, 1990.
14.
Manual of Cross-Connection Control, Ninth Edition, Foundation for Cross-Connection
Control and Hydraulics Research, University of Southern California, December 1993.
15.
National Standard Plumbing Code, National Association of Plumbing, Heating, and
Cooling Contractors, 1996.
16.
Cross-Connection Protection Device Booklet, Third Edition, American Society of
Sanitary Engineering, 1994.
17.
Manual of Cross-Connection Control, National Association of Plumbing-HeatingCooling Contractors, 1996.
A-1
APPENDIX B
SUMMARY OF STATE CROSS-CONNECTION CONTROL REQUIREMENTS
A brief overview of individual state cross-connection control program requirements is provided
below. Table B-1 provides more specific information regarding criteria, guidelines, and codes
and standards for individual states.
•
Alabama - Regulations mandate premises containment by the installation of backflow
prevention devices in facilities where it is determined that there are existing or potential
cross-connections. A cross-connection control program is required. Device types, testing,
maintenance, and installation methods are not specified. Record keeping is not specified.
•
Alaska - Regulations mandate point-of-use isolation of equipment or systems by the
installation of backflow prevention devices. A cross-connection control program or plan is
not specified. Backflow prevention device design and performance standards are specified.
Device testing, maintenance, and installation methods are not specified. Tester certification
is not specified. Record keeping is not specified.
•
Arizona - Regulations mandate premises containment and point-of-use isolation of
equipment or systems by the installation of backflow prevention devices. A crossconnection control program or plan is not specified. Regulations specify backflow incident
reporting requirements. Backflow prevention device design and performance standards are
not specified. However, devices used in the state must be those approved by the Foundation
for Cross-Connection Control and Hydraulics Research (FCCCHR) or other agency as
specified by the state's Department of Environmental Quality. Regulations specify backflow
prevention device installation and testing requirements. Certification of testers is required.
Record keeping is required.
•
Arkansas - Regulations mandate a cross-connection control program with specific key
elements. Additionally, facility inspections, premises containment, and point-of-use
isolation of equipment or systems by the installation of backflow prevention devices is
required. Device design requirements and installation methods are specified in the State
Plumbing Code. Testing requirements are specified. Certification of testers is required, and
repairers of devices must be a Master Plumber. Record keeping is required.
•
California - Regulations mandate a cross-connection control program with specific key
elements. Additionally, facility inspection, premises containment, and point-of-use isolation
of equipment or systems is required. Backflow prevention device design and performance
standards are specified. Device testing is specified. Certification of testers is required.
Record keeping is required.
•
Colorado - Regulations mandate cross-connection control. A cross-connection control
program is required. However, regulations require identifying cross-connections and require
the installation, testing, and maintenance of backflow prevention devices. Certification of
testers is required. Record keeping is required.
•
Connecticut - Regulations mandate premises containment and point-of-use isolation of
equipment or systems by the installation of backflow prevention devices. A crossconnection control program is required.
Backflow prevention device design and
performance standards, installation methods, and testing are specified.
testers is required. Record keeping is required.
•
•
Certification of
Delaware - There are no cross-connection control regulations in this State.
B-1
District of Columbia - There are currently no cross-connection control regulations.
However, applicable regulations are under development. The Building Officials and Codes
Administrators (BOCA) National Plumbing Code, 1990 Edition, has been adopted by the DC
Government and amended.
•
Florida - Regulations mandate a cross-connection control program and written plan.
Premises containment by the installation of backflow prevention devices is required. Current
regulations are under revision. Proposed revisions include backflow prevention device
design and performance standards, installation locations and methods, testing frequencies,
maintenance requirements, and tester certification.
•
Georgia - Regulations prohibit cross-connections. Brief guidelines are provided in the
regulations along with additional references. A written cross-connection control plan
approved by the state is required when requested by the Division of Environmental
Protection.
Backflow prevention device types, installation methods, testing, and
maintenance is not specified. Record keeping is not specified.
•
Hawaii - Regulations mandate a cross-connection control program. Premises containment
and point-of-use isolation by the installation of backflow prevention devices is required.
Device design and performance standards are specified. Device installation methods and
locations are Specified. Device maintenance and testing requirements are specified.
Certification of testers is required. Record keeping is required.
•
Idaho - Regulations mandate a cross-connection control program. Facility inspections are
required. Device design and performance standards are specified for Atmospheric Vacuum
Breaker and Pressure Vacuum Breaker backflow prevention devices. The state maintains a
list of approved types of backflow prevention devices. Device testing is specified.
Certification of testers is required. Record keeping is not specified.
•
Illinois - Regulations mandate protection of public water systems by the prohibition of crossconnections. A state approved written cross-connection control program is required.
Regulations require point-of-use isolation by the installation of backflow prevention devices
at selected plumbing outlets and fixtures, and containment by the installation of backflow
prevention devices at the water service connection. Guidelines are provided in the
regulations. Types of devices, installation methods, maintenance, and testing is specified.
Testers licensing and certification requirements are specified. Record keeping is specified.
•
Indiana - Regulations mandate protection of the public water system by the prohibition of
cross-connections. A cross-connection control program is not required, but suggested.
Guidelines are provided in the states Cross-Connection Control Manual, revised and
reprinted in February 1996. Regulations require facility containment and point-of-use
isolation by the installation of backflow prevention devices. Types of devices, installation
methods, maintenance, and testing is specified. Tester certification is specified. Record
keeping is specified.
•
•
Iowa - Regulations mandate cross-connection control by the installation of backflow
prevention devices. A cross-connection control program is required. Point-of-use isolation
is required. Containment is not specified. Backflow prevention devices must be those types
approved by the state Department of Natural Resources. Device design and performance
standards are specified. Backflow prevention device installation methods, testing, and
maintenance is not specified. Record keeping is not specified.
B-2
Kansas - Regulations mandate a cross-connection control program. Specific elements of the
program are specified and additional guidelines are referenced. Premises containment and
point-of-use isolation are specified. Design and performance standards are not specified.
However, devices must be those approved for use by a designated agency. Device
installation methods, testing, and maintenance are specified. Tester certification is not
specifically required. However, those persons performing tests must have received training
recognized by the local water purveyor. Record keeping is specified.
•
Kentucky - Regulations prohibit cross-connections. The use of backflow prevention devices
must be approved by the state Natural Resources and Environmental Protection Cabinet.
Regulations mandate identification and elimination of cross-connections. Guidelines for the
use and installation of backflow prevention devices are provided in the State Plumbing Code.
Certification of testers is the responsibility of the State Plumbing Division. Record keeping
is not specified.
•
Louisiana - Regulations prohibit cross-connections. A cross-connection control program is
not required. Cross-connection protection is required through the use of air gaps only.
Backflow prevention devices are not considered adequate protection for cross-connections.
•
Maine - Regulations mandate a written cross-connection control program for all water
systems serving 1,000 or more people, and all industrial facilities. Application and permits
are required for all cross-connections. Facility inspections are not specified. Premise
containment is not specified. Equipment and system isolation is specified. Design,
performance, or approved types of backflow prevention devices are not specified.
Installation methods are not specified. Device testing and maintenance is specified.
Certification of testers is not required.
•
Maryland - Regulations mandate a written cross-connection control program approved by the
state. Record keeping is not specified. Guidelines and requirements for backflow prevention
are provided in the State Plumbing Code. Testers must be licensed plumbers.
•
Massachusetts - Regulations mandate a written cross-connection control plan approved by
the Department of Environmental Protection (DEP). Premises inspection, containment, and
system and equipment isolation by the installation of backflow prevention devices are
required. Devices must be those approved for use by the Board of State Plumbing Examiners
and/or the DEP. Device location, installation, testing, and maintenance is specified.
Certification of testers is required. Record keeping is required, including annual reports.
•
Michigan - Regulations mandate a written cross-connection control program approved by the
Department of Public Health (DPH). Guidelines are specified. Premises inspections are
required every 3 to 6 months depending on type of system or equipment. Premises
containment and/or point-of-use isolation is dependent on type of facility, system, or
equipment. Backflow prevention device types are specified. Design and performance
standards are not specified. However, an approved list of devices is retained by the DPH.
Device location, installation methods, and testing requirements are specified. Certification of
testers is not required. Record keeping is specified.
•
Minnesota - Regulations prohibit cross-connections and mandate cross-connection control by
the installation of backflow prevention devices. System and equipment point-of-use isolation
is specified. A cross-connection control program or plan is not specified. However,
development and implementation of a program is recommended by the Department of
Health. Regulations require backflow prevention devices be tested and maintained on a
continuing basis to ensure proper operation. Devices must be those approved by a testing
laboratory recognized by the state Department of Health. Types of devices and installation
methods and locations are specified. Certification of testers is specified. Record keeping is
not specified.
B-3
Mississippi - There are no cross-connection regulations in this State.
•
•
Missouri - Regulations mandate cross-connection control. Premises containment and pointof-use system or equipment isolation is specified. Device design and performance standards
are not specified. However, devices used must be those approved by the Department of
Natural Resources. Device location, installation methods, and testing frequencies are
specified. Certification of testers is specified. Record keeping is specified.
•
Montana - Regulations mandate cross-connection control. A cross-connection control plan is
not required. Backflow prevention device types, installation methods, and testing are
specified in the adopted plumbing code. Tester certification is not required. Regulations are
under revision. New regulations will be more stringent. Expected adoption is in the fall of
1997.
•
Nebraska - Regulations mandate a cross-connection control program approved by the state
Department of Health. Specific program elements are specified. Additional guidelines are
referenced. Premises containment and point-of-use system or equipment isolation is
specified. Device design and performance standards are not specified. However, devices
used must be those approved by a specified testing agency. Device location, installation
methods, and testing frequencies are specified. Certification of testers is specified. Record
keeping is specified.
•
Nevada - Regulations mandate a cross-connection control program approved by the State or
local health authority. Components of the program are specified. Premises containment and
point-of-use system or equipment isolation is specified. Device design and performance
standards are specified. Device location, installation methods, and testing frequencies are
specified. Certification of testers is specified. Record keeping is specified.
•
New Hampshire - Regulations mandate a cross-connection control program approved by the
state Department of Environmental Services (DES). Program responsibilities are specified.
Premises containment and point-of-use system or equipment isolation is specified. Device
design and performance standards are not specified. However, devices used must be those
approved by the DES. Device location, installation methods, and testing frequencies are
specified. Certification of testers is specified. Record keeping is specified.
•
New Jersey - Regulations mandate cross-connection control through the states Physical
Connection Program. A written or plan is required. State permits are required for all
physical connections. Premises containment and point-of-use system or equipment isolation
is specified. Device design and performance standards are specified. Device location,
installation methods, and testing frequencies are specified. Certification of testers is not
specified. Record keeping is specified.
•
New Mexico - Regulations mandate protection of water systems by the installation of a
backflow prevention device. A cross-connection control program or plan is not specified.
Premises containment and point-of-use isolation is not specified. Design and performance
standards are not specified. However, devices used must be approved by the state
Environment Department or other agency acceptable to the state. Device locations,
installation methods, and testing are not specified. Certification of testers is not specified.
Record keeping is not specified.
•
B-4
New York - Regulations mandate cross-connection control. A program is required.
Guidelines are provided in the state Cross-Connection Control Manual. Premises
containment and point-of-use isolation by the installation of backflow prevention devices is
specified. Design and performance standards are specified. Device type and approval is
specified. Device locations, installation methods, testing, and maintenance is specified.
Certification of testers is specified. Record keeping is specified. Plans and drawings with
specific elements must be submitted and approved by the State Department of Health prior to
the installation of any backflow prevention device.
•
North Carolina - Regulations mandate cross-connection control. A program or plan is not
specified. Guidelines for cross-connection control are provided as a supplement to the state
Rules Governing Public Water Supplies. Premises containment is not specified. System or
equipment point-of-use isolation is specified. Design and performance standards are
specified. Device location is specified. Device testing and maintenance is not specified.
Certification of testers is not specified. Record keeping is not specified.
•
North Dakota - Regulations mandate cross-control. A program or plan is not specified.
Device type is specified. Training and certification of testers is recommended..
•
Ohio - Regulations mandate cross-connection control. A program or plan is recommended.
Suggested elements of a program are provided in the states Backflow Prevention and Cross-
Connection Control Manual. Premises containment and system or equipment point-of-use
isolation are specified. Design and performance standards are specified. Device location,
installation methods, testing frequencies, and maintenance is specified. Certification of
testers is required. Record keeping is required.
•
Oklahoma - Regulations prohibit cross-connections. A cross-connection control program is
not required. Backflow prevention devices are required and specified by the State Plumbing
Code. Certification of testers is not required.
•
Oregon - Regulations mandate a cross-connection control program. Specific elements of the
program are specified. Premises containment and system or equipment point-of-use isolation
are specified. Device design and performance standards are specified. Device location,
installation methods, and testing are specified. Certification of testers is specified. Record
keeping is specified.
•
Pennsylvania - Regulations mandate a cross-connection control program approved by the
state Department of Environmental Resources. Elements of the program are specified.
Premises containment and system or equipment point-of-use isolation are specified. Device
design and performance standards are specified. Device location, installation methods, and
testing is specified. Certification of testers is specified.
•
Puerto Rico - There are no cross-connection control regulations in this US Territory.
•
Rhode Island - There are no cross-connection regulations in this State.
•
South Carolina - Regulations mandate a cross-connection control program. Elements of the
program are specified. Premises containment and system or equipment point-of-use isolation
is not specified. Device design and performance standards are not specified. However,
devices used must be those approved and listed by the state. Device location, installation
methods, and testing requirements are specified. Certification of testers is specified. Record
keeping is specified.
•
B-5
South Dakota - Cross-connection control is mandated in the State Plumbing Code. The code
acts as the state's only requirements and as the guidelines. A cross-connection control
program is not required. Backflow prevention device types, installation methods, and testing
and maintenance requirements are specified in the code. Tester certification is not required.
Record keeping is not specified.
•
Tennessee - Regulations mandate a cross-connection control plan approved by the state
Department of Environment and Conservation. Elements of the plan are specified. Premises
containment and system or equipment point-of-use isolation are specified. Device design
and performance standards are specified. Device location, installation methods, and testing
frequencies are specified. Certification of testers is specified. Record keeping is specified.
•
Texas - Regulations mandate cross-connection control. A written program or plan is not
specified. Premises containment is not specified. System or equipment point-of-use
isolation is specified. Device design and performance standards are specified. Device
location and installation methods are not specified. Device testing is required upon
installation. Additional testing is recommended annually. Certification and licensing of
testers is required by the State Plumbing Code and administered by the State Board of
Plumbing Examiners. Record keeping is not required. However, device test and
maintenance reports are recommended.
•
Utah - Regulations mandate cross-connection control. A written cross-connection control
program approved by the state is required. Suggested elements of the program are provided
in the state guidelines. Premises containment is recommended. Plumbing code requires
point-of-use isolation by the installation of backflow prevention devices at selected fixtures
and outlets. Devices must be installed in accordance with state guidelines and plumbing
code. A list of approved devices is maintained by the state. Initial and annual device testing
is specified. Program administration, device tester, and instructor certification is required.
Record keeping procedures are specified.
•
Vermont - Regulations do not mandate cross-connection control. However, if the inspection
of a water system by the Agency of Natural Resources, Department of Environmental
Conservation (ANRDEC) discovers that a cross-connection exists, the water supplier must
take action to eliminate the cross-connection or install a backflow prevention device.
Devices must meet American Water Works Association standards. No additional
requirements are specified.
•
Virginia - Regulations mandate a written cross-connection control program approved by the
local office of the Department of Health. Suggested elements of the program are provided.
Facility inspections are specified. Premises containment is specified. However, system or
equipment point-of-use isolation is not specified. Devices used must conform to the
requirements specified in the Uniform Statewide Plumbing Code (USPC). A list of approved
devices is maintained by the Department of Health. Device location is specified. Installation
methods are specified in the USPC. Testing is required annually. Certification of testers is
not currently required. However, testers must be licensed by the state beginning 1 July,
1997. Record keeping is not specified. However, it is recommended and elements are
suggested.
•
Washington - Regulations mandate a cross-connection control program acceptable to the
state Department of Health. Premises containment and system or equipment point-of-use
isolation is specified. Device design and performance standards are not specified. However,
a list of approved devices is maintained by the state Department of Health. Device location
and installation methods are specified. Device testing is required annually. Certification of
testers is required. Record keeping is specified.
•
B-6
West Virginia - Regulations mandate a cross-connection control program approved by the
state Department of Health and Human Services (DHHS). Premises containment and system
or equipment point-of-use isolation are specified. Performance and design standards are
specified. Device location and installation methods are specified. Testing is required.
Certification of testers is required.
•
Wisconsin - Regulations mandate a written cross-connection control program. The program
must be annually reviewed by the state Department of Natural Resources (DNR). Elements
of the program are specified. Premises containment and system or equipment point-of-use
isolation is specified. Device performance and design standards are specified. Location and
installation methods are specified in the State Plumbing Code. Testing frequencies are
specified. Certification of testers is specified. Record keeping is required for the location,
manufacturer, model, size, serial number, date of the last test of the device, and the name of
the tester.
•
Wyoming - Regulations mandate cross-connection control. A program or plan is not
specified. Premises containment and system or equipment point-of-use isolation is specified.
Device design and performance standards are not specified. However, device approval is
specified. Device installation location is not specified. Device installation method is
specified for Pressure Vacuum Breaker devices and physical air gaps. Testing and
maintenance of devices is not specified. Certification of testers is not specified. Record
keeping is not specified.
The following definitions/clarifications are included as a supplement to Table B-1. Note that a
blank cell indicates no particular state mention or requirement for that item.
1. State
State in which requirements apply.
2. Cross-Connection Control (Criteria)
Broad-based criteria regarding cross-connection in appropriate state.
•
CCC - Cross-Connection Control Program - Regulatory requirement for the
implementation to some degree of a physical cross-connection control program.
•
CCCP - Cross-Connection Control Plan - Written document detailing the crossconnection control program.
3. Cross-Connection Control (Applicable Guidelines, Codes, and Other References)
General cross-connection control requirements for a given state are detailed in the
reference(s) indicated.
•
FCCCHR - Foundation for Cross-Connection Control and Hydraulic Research
•
AWWA - American Water Works Association
•
BOCA - Building Officials and Code Administration
•
State Reg. - Specific guidelines detailed in the state regulations.
•
State PC/BC - State Plumbing or Building Code
•
•
B-7
State CCC Manual - State Cross-Connection Control Manual
Other - Any number of less common references (i.e. National Fire Protection Association
(NFPA) Standards).
4. Backflow Prevention Device Approval/Standards
Approved and/or acceptable backflow prevention devices for a given state are detailed in the
reference(s) indicated.
•
FCCCHR - Foundation for Cross-Connection Control and Hydraulic Research
•
ANSI - American National Standards Institute
•
AWWA - American Water Works Association
•
ASSE - American Society of Sanitation Engineers
•
State - State regulations include specific device approvals and standards
•
Other - Any number of less common references
5. Backflow Prevention Device Tester
Specific state requirements placed on backflow prevention device testers may include any or
all of the following.
•
Certificate - A certificate offered by the state or a state approved agency is
required/recommended in order to test backflow prevention devices.
•
Training - Some minimum level of training is required/recommended in order to test
backflow devices. Verification of this training is typically required.
•
License - A state license is required/recommended in order to test backflow prevention
devices. Potential licenses include plumbing licenses, fire inspector licenses, and crossconnection licenses.
B-8